This would be great! I have polygons representing work areas that are building up on top of each other and it is of no use to the operations teams because it is just a mess of data. Time slider with dynamic data would be great!
Nick Morgan are you using just a web map to display your weather in a dashboard? If you're solely using a web map then you can set a refresh interval on the layers in the map and they'll dynamically update. Does this solve you're isue or are you doing something else?
We're currently using this functionality on one of our dashboards so I just thought i'd mention it.